It will work dot to dot ( 12 o'clock crank - 6 o'clock cam) or (12 o'clock crank - 12 o'clock cam ), because cam speed is 1/2 crank speed.Will H said:Setup: Number one piston at TDC, dot on crank sprocket at 12 o'clock, pin on cam at 3 o'clock, hole in cam sprocket for pin at 3 o'clock, dot on cam sprocket at 12 o'clock. this didn't seem right but both valves on number one were closed so I went right on. Aligned the dots with a straight edge and bolted it up. Motor runs fine. this is a 1970 350 block and crank. This dot setup doesn't seem right but it works. What should I know that I don't know?